If you are sure that the springs are installed the right way and it still sags a little Global west sells spacers that go between the control arm and the spring to cure the problem.
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NA 347 W/ stage 2 Canfield heads, out of the box Victor 5.0 intake, solid roller cam, Aeromotive fuel system.
MY CAR
http://www.mustangworks.com/cgi-bin/...splay.cgi?1288